Tarrian's Soulcleaver + Scurry Oak + Thermopod

Tarrian's Soulcleaver

Scurry Oak

Thermopod

How it works

1. Put a +1/+1 counter on Scurry Oak.
2. Scurry Oak triggers, creating a 1/1 Squirrel creature token.
3. Activate Thermopod's second ability by sacrificing the Squirrel, adding .
4. When the Squirrel dies, Tarrian's Soulcleaver triggers, putting a +1/+1 counter on Scurry Oak.
5. Scurry Oak triggers, creating a 1/1 Squirrel creature token.
6. Repeat from step 3.

This clever loop starts with a single +1/+1 counter to set off Scurry Oak, whose triggered ability creates a 1/1 green Squirrel creature token whenever counters are placed on it. You can immediately feed that fresh token to Thermopod, sacrificing it to generate red mana while simultaneously triggering Tarrian's Soulcleaver. Because the Soulcleaver places a +1/+1 counter on its equipped creature whenever another artifact or creature hits the graveyard, the sacrificed Squirrel pumps Scurry Oak right back up, restarting the entire token-generating cycle and leaving you with an arbitrarily large creature alongside infinite red mana.